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. W. HANSEN.

I APPARATUS FOR DRYING CASTING MOLDS. No. 530,641. I I Patented Dec.11,1894.

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W. HANSEN. APPARATUS- FOR DRYING CASTING MOLDS.

NO. 530,641. Patented Dec. 11, 1894.

(No Model.) 3 sheets-sheet 3.

W. HANSEN.

APPARATUS FOR DRYING CASTING MOLD$ No. 580,641. Patented 1390.11, 1894.

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UNIT D STATES I PATENT OFFICE.

WILHELM HANSEN, on GOTHA, GERMANY.

APPARATUS FOR DRY lNGCASTlNG-MOLDS.

SPECIFICATION forming part of Letters Patent No. 530,641, dated December11, 1894. pp ca filed January 10. 1893. Renewed January 11. 1894. Serial110.496,!552. (N0 mode To all whom it may concern:

Be it known that LWILHELM HANSEN, a subject of the Emperor of Germany,residing at Gotha, Germany, have invented new and useful Improvements inan Apparatus for Drying Casting-Molds, of which the following is aspecification.

It is the object of my invention to provide an apparatus of simple andefiective form adapted for supplying heated air and gas to molds for thepurpose of drying them, said apparatus being intended to operate inconnection with loam molds or molds in the ground which cannot be movedbodily or upon cast molds generally, capable of being transported to theheating apparatus or upon cast molds which cannot be moved.

My invention is intended to obviate many of the inconveniences suiferedby the workmen heretofore arising from the smoke or gas discharged fromthe heating device, to reduce the time necessary to complete the dryingas also the amount of fuel used.

The heating apparatus in order to meet the above objects must be capableof being trans-'- p'orted or of being fixed in place. The air requiredfor combustion and for the generating of heat andwhich must besuperheated is carried into the apparatus, from a blowing machinethrough pipes or through a hose adapted for that purpose.

Figure 1, shows a vertical longitudinal section of the apparatus; Fig.2, a horizontal section through the upper air channels. Fig. 3, showsthe apparatus applied to a mold for casting a spur wheel. paratus forheating light molds. Figs. 5 and 6, are respectivelyan end elevation anda detail plan view of the apparatus as set up in connection with acasting house.

The apparatus consists essentially of two combustion chambers, a and b.The first chamber for instance is filled up to a certain point withcoke, which rests upon a perfo; rated roasting plate h, or grate. A freespace is left above the bed of coke for combustion. The chamber b, isthe super-heating chamber.

The cold air enters a channel (1, d, through inlet pipe 0. Here it isdivided into two parts. One part enters the chamber a, through the Fig.4, shows the ape,e, 6, over the burning material and/from there it mixeswith the products of the combustion in the super -heating chamber. b.Here where the flame can develop freely, the

bustion more complete. Finally, the final product consisting in a highlyheated mixture of atmospheric air and gas, passes into the casting moldwhich is to be heated, through the socket piece f. I v

The proportions of the quantities of air passing through and over theburning material are regulated by the regulator'valves 2' and is, in theseparating channel 01, (Z. By this arrangement it is possible when thevalves are put in the proper position, to cause the temperature of theincoming air to rise to any desired degree of heat and to keep it atthat desired point. As a rule the lower regulator almost entirely open.

The spy-holes g, g, are provided to enable the attendant to see thelength of the flame in the chamber 6, so that the same may be regulated.The main regulator valve Z,is intended to regulate the quantity ofincoming air which is varied according to the different requirements ofthe work.

The mixture of super-heated air and gas which issues into thecastingmold through the socket-piece f, has in its strongly overheatedstate, an extraordinary evaporating power and acts uniformly upon everynook and corner of the mold when broughtinto it from above.

Fig. 3, shows the application of the drying apparatus to the castingmold for a spur wheel. For the sake of distinctness the curbs areabnormally thick. The top box does not fit tight to the drag box but asmall space is left for the escape of the air and gas. The escape pipefor the core gas ismade a little larger than necessary in order tofacilitate the air heatingapparatus. The arrows show Ahe direction inwhich the hot air moves. lhe top box and the drag box are dried simul-"taneously. For the drying of long and proportionately narrow castingmolds as for instance for cheeks of a lathe, faces of a planplate It,and the bed of burning material, but the other part passes through theopening e,

plates, &c., the molds are built together but Valve is is almost closedand the uppenone 1',

mix-ing becomes more thorough and the com a the coming in of the airwhich escapes from ing machine, plates of a steam engine or base 7 ingsreach near to the bottom of the lowest parts of. the mold. In this caseit is necessary as a rule to use two ovens or more which must be mountedatthe extremities of the casting mold in such a way that the hot air isintroduced from above.

If the false cores are not attached to the top box, it is possible tocarry the same into a drying stove so that only the part which is formedin the ground and the top box need to be dried by the apparatus abovedescribed. When it is desired to treat molds of clay or of so calledpaste for steam cylinders or large pipes, said molds must be shut off attheir upper part by a cast iron plate in the center of which a hole isdrilled for introducing the super-heated air. The latter isblowndownward into it and only a small circular space is left open atthe bottom for the escape of the hot air. For the drying of small moldsit is better to use fixed apparatus supported upon a frame as shown inFig. 4. A light wag'on runs over rails below. The mold upon the wagon iscovered with a cast iron plate in the center of which a hole is drilledfor the inlet of the super-heated air. For smaller molds it is notnecessary to use the covering plate. The said covering plate may besupported on the nozzle f, so as to leave a space between it and themold for the escape of the air.

Figs. 5 and 6 represent a casting house provided with this super-heatingapparatus. The main air supply pipes X are located between the ironbearers or beams which carry the frame of the roof and the movablecranes. Between each two of the beams one or more nozzles as (when themachine is not working they are closed by covers) project from the lowerpart of the main air pipes for supplying air to the heating apparatus.The connection between these nozzles and the fixed air heating apparatusis established by fixed pipes 00 The connection between the movableapparatus and the nearest nozzle w is efiected by flexible pipes or anysuitable form of hose w.

I claim as my invention- 1. An apparatus for heating and drying molds bya current of air and combustion gases comprising a furnace, a valvedconduit low the grate and with the space between the same and theoutlet, the valves in said branches regulating the supply of compressedair under the grate of the furnace and into the combustion chamber, amain valve in the main portion of the conduit for regulating the entireblast entering the apparatus and a mixing chambercommunicating with thecombustion space and having a downwardly projecting nozzle to dischargethe hot products into the mold, substantially as described.

3. An apparatus for heating and drying molds by a current of air andcombustion gases comprising a furnace, a conduit having branchescommunicating with the space below the grate and with the space betweenthe grate and the outlet, the valves for regulating the flow ofcompressed air through said branches, a main valve in the main portionof the conduit for regulating the entire blast entering the apparatusand the mixing chamber communicating with the combustion space above thegrate and having the downwardly projecting nozzle leading therefrom todischarge the hot products into the mold, said mixing chamber havingalso the sight holes therein, substantially as described.

4. An apparatus for drying molds by a current of air and combustiongases comprising a furnace, a conduit having branches communicating withthe space below the grate and with the space between the grate and theoutlet, and a mixing chamber communicating with the combustion space andhaving a downwardly projecting nozzle to discharge the hot products intothe top of the mold, said apparatus being portable, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

. WILHELM HANSEN. Witnesses:

FRANZ KASSLAOHER, FRIEDRICH CORRELL.

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